Immunization with α-synuclein/Grp94 reshapes peripheral immunity and suppresses microgliosis in a chronic parkinsonism model
2018 | 2019
Villadiego Luque, Francisco Javier | Labrador Garrido, Adahir | Franco, Jaime M. | Leal Lasarte, Magdalena | Genst, Erwin J. de | Dobson, Christopher M. | Pozo Pérez, David | Toledo Aral, Juan José | Roodveldt, Cintia | Universidad de Sevilla. Departamento de Bioquímica Médica y Biología Molecular e Inmunología | Universidad de Sevilla. Departamento de Fisiología Médica y Biofísica | Cambridge Center for Misfolding Diseases | European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) | Instituto de Salud Carlos III | Junta de Andalucía | Ministerio de Economía. España
Neuroinflammation mediated by chronically activated microglia, largely caused by abnormal accumulation of misfolded α-synuclein (αSyn) protein, is known to contribute to the pathophysiology of Parkinson’s disease (PD). In this work, based on the immunomodulatory activities displayed by particular heat-shock proteins (HSPs), we tested a novel vaccination strategy that used a combination of αSyn and Grp94 (HSPC4 or Gp96) chaperone and a murine PD model. We used two different procedures, first, the adoptive transfer of splenocytes from αSyn/Grp94-immunized mice to recipient animals, and second, direct immunization with αSyn/Grp94, to study the effects in a chronic mouse MPTP-model of parkinsonism. We found that both approaches promoted a distinct profile in the peripheral system -supported by humoral and cellular immunity- consisting of a Th1-shifted αSyn-specific response accompanied by an immune-regulatory/Th2-skewed general phenotype. Remarkably, this mixed profile sustained by αSyn/Grp94 immunization unexpectedly led to strong suppression of microglial activation in the substantia nigra and striatum, pointing to a newly described beneficial effect of anti-αSyn Th1-responses in the context of PD. This strategy is the first to target αSyn and report the suppression of PD-associated microgliosis. Overall, we show that the αSyn/Grp94 combination supports a distinct and long-lasting immune profile in the peripheral system, which has an impact at the CNS level by suppressing chronic microglial activation in an MPTP model of PD. Furthermore, our study demonstrates that reshaping peripheral immunity by vaccination with appropriate misfolding protein/HSP combinations could be highly beneficial as a treatment for neurodegenerative misfolding diseases.
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